06Stacked and grouped show the same numbers twice

<main class="stage">
  <figure class="sk is-demo" id="sk" data-mode="stack">
    <figcaption class="sk__head">
      <span class="sk__title">Visits by channel</span>
      <button class="sk__btn" type="button" id="sk-btn" aria-pressed="false" aria-label="Change bar arrangement">
        <span class="sk__lab sk__lab--side">Show side by side</span>
        <span class="sk__lab sk__lab--stack">Show stacked</span>
      </button>
    </figcaption>

    <div class="sk__legend" aria-hidden="true">
      <span class="sk__key"><i class="sk__dot sk__dot--a"></i>This month</span>
      <span class="sk__key"><i class="sk__dot sk__dot--b"></i>Last month</span>
    </div>

    <div class="sk__plot" role="img" aria-label="This-month and last-month visit bars for 4 channels. Search 60·24, Direct 36·22, Referral 48·30, Social 20·12">
      <div class="sk__col">
        <span class="sk__tot">84</span>
        <span class="sk__b sk__b--a"></span><span class="sk__b sk__b--b"></span>
      </div>
      <div class="sk__col">
        <span class="sk__tot">58</span>
        <span class="sk__b sk__b--a"></span><span class="sk__b sk__b--b"></span>
      </div>
      <div class="sk__col">
        <span class="sk__tot">78</span>
        <span class="sk__b sk__b--a"></span><span class="sk__b sk__b--b"></span>
      </div>
      <div class="sk__col">
        <span class="sk__tot">32</span>
        <span class="sk__b sk__b--a"></span><span class="sk__b sk__b--b"></span>
      </div>
      <span class="sk__x">Search</span><span class="sk__x">Direct</span><span class="sk__x">Referral</span><span class="sk__x">Social</span>
    </div>

    <p class="sk__hint">Press it and the same bars swap between stacked and side by side</p>

    <div class="sr">
      <span aria-live="polite" id="sk-live"></span>
      <table>
        <caption>Visitors by channel</caption>
        <thead><tr><th>Channel</th><th>This month</th><th>Last month</th><th>Total</th></tr></thead>
        <tbody>
          <tr><th>Search</th><td>60</td><td>24</td><td>84</td></tr>
          <tr><th>Direct</th><td>36</td><td>22</td><td>58</td></tr>
          <tr><th>Referral</th><td>48</td><td>30</td><td>78</td></tr>
          <tr><th>Social</th><td>20</td><td>12</td><td>32</td></tr>
        </tbody>
      </table>
    </div>
  </figure>
</main>

@use "../../../../site/static/demo-tokens" as *;

// 두 계열의 높이(px). 막대 구역이 76px 고정이라 값/100×76 로 정한다 — 84·58·78·32.
// 합계 라벨(84명…)도 이 값에서 나온다. 소수는 그대로 둔다(76px 안에서만 쓰인다)
$ha: 45.6px 27.4px 36.5px 15.2px;   // 이번 달 60·36·48·20
$hb: 18.2px 16.7px 22.8px 9.1px;    // 지난 달 24·22·30·12

$duration: $dur-quick;
$easing: $ease-spring;
$color: $subject-blue;

@include stage($stage-yellow);

.sr {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.sk {
  box-sizing: border-box;
  width: min(392px, 88vw);
  display: flex;
  flex-direction: column;
  gap: $sp-2;
  margin: 0;
  padding: $sp-3;
  border-radius: $r-card;
  background: $stage-paper;
  box-shadow: $shadow-raised;
  color: $subject-ink;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

.sk__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: $sp-2;
  padding: 0 $sp-1;
}
.sk__title { font-size: 13px; line-height: 18px; font-weight: 800; letter-spacing: .02em; }

// 토글 — aria-pressed 로 눌림을 알린다. 두 라벨을 한 칸에 겹쳐 놓고
// data-mode 가 보여 줄 쪽만 딱 바꾼다(교체지 페이드가 아니다)
.sk__btn {
  position: relative;
  display: grid;
  place-items: center;
  margin: 0;
  padding: $sp-1 $sp-3;
  border: 0;
  border-radius: $r-pill;
  background: $color;
  color: $stage-paper;
  font-family: inherit;
  font-size: 12px;
  line-height: 18px;
  font-weight: 800;
  cursor: pointer;
}
.sk__btn[aria-pressed="true"] { background: $subject-ink; }
.sk__btn:focus-visible { outline: 2px solid $subject-ink; outline-offset: 2px; }
.sk__lab { grid-area: 1 / 1; white-space: nowrap; }
.sk[data-mode="stack"] .sk__lab--stack,
.sk[data-mode="side"] .sk__lab--side { visibility: hidden; }

.sk__legend {
  display: flex;
  gap: $sp-3;
  padding: 0 $sp-1;
  font-size: 11px;
  line-height: 16px;
  font-weight: 700;
  color: rgba(23, 20, 26, .62);
}
.sk__key { display: inline-flex; align-items: center; gap: $sp-1; }
.sk__dot { width: 8px; height: 8px; border-radius: $r-xs; }
.sk__dot--a { background: $color; }
.sk__dot--b { background: $subject-ink; }

// ── 차트: 카테고리 4칸 grid, 아래 축 라벨이 같은 grid 의 둘째 줄 ──
.sk__plot {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: 96px 14px;
  column-gap: $sp-2;
  padding: 0 $sp-1;
}
.sk__x {
  grid-row: 2;
  text-align: center;
  font-size: 11px;
  line-height: 14px;
  font-weight: 700;
  color: rgba(23, 20, 26, .62);
}

// 칸 하나 — 안은 다시 2열 grid. 막대 둘은 **같은 칸(grid-column: 1 / -1)에 겹쳐** 놓고
// 쌓기/나란히를 전부 transform 으로 갈아입는다. grid 칸 배치를 모드마다 바꾸면
// transition 이 안 되고 레이아웃이 점프한다 — 그래서 칸은 고정, transform 이 움직인다
.sk__col {
  grid-row: 1;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  grid-template-rows: 20px 1fr;
  align-items: end;
  border-bottom: 1px solid rgba(23, 20, 26, .14);
}
// 합계 라벨은 모드에 따라 자리가 달라진다 — 쌓기에서는 두 계열을 덮는 한 줄,
// 나란히에서는 위 칸 반쪽(grid-column: 1)으로 물러난 뒤 감춘다. 어차피 컷으로
// 사라지니 점프는 보이지 않는다
.sk__tot {
  grid-row: 1;
  grid-column: 1 / -1;
  align-self: end;
  justify-self: center;
  font-size: 10px;
  line-height: 14px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  color: rgba(23, 20, 26, .72);
}
.sk[data-mode="side"] .sk__tot { grid-column: 1; grid-row: 2; justify-self: start; visibility: hidden; }

.sk__b {
  grid-row: 2;
  grid-column: 1 / -1;
  align-self: end;
  transform-origin: 0 100%;     // 왼쪽 아래 고정 — scaleX 로 폭을 줄여도 바닥은 그대로
  border-radius: $r-xs $r-xs 0 0;
}
.sk__b--a { background: $color; }
.sk__b--b { background: $subject-ink; }

@for $i from 1 through 4 {
  .sk__col:nth-child(#{$i}) .sk__b--a { height: nth($ha, $i); }
  .sk__col:nth-child(#{$i}) .sk__b--b { height: nth($hb, $i); }
}

// ── 정적 경로(사람이 만진 뒤). 쌓기 ↔ 나란히 전부 transform ──
// 나란히: 두 계열이 각자 반쪽으로 폭을 줄고(sX .44) 좌우로 벌어진다(tX 3%·53%).
// 쌓기: b 계열이 a 위로 올라탄다(tY −a높이). 함수 목록 순서는 언제나 동일해야 보간된다
.sk[data-mode="side"] .sk__b--a { transform: translateX(3%) scaleX(.44); }
.sk[data-mode="side"] .sk__b--b { transform: translateX(53%) translateY(0) scaleX(.44); }
.sk[data-mode="stack"] .sk__b--a { transform: translateX(0) scaleX(1); }
@for $i from 1 through 4 {
  .sk[data-mode="stack"] .sk__col:nth-child(#{$i}) .sk__b--b {
    transform: translateX(0) translateY(#{-1 * nth($ha, $i)}) scaleX(1);
  }
}

.sk:not(.is-demo) .sk__b {
  transition-property: transform;
  transition-duration: $duration;
  transition-timing-function: $easing;
}

.sk__hint { margin: 0; padding: 0 $sp-1; font-size: 11px; line-height: 16px; color: rgba(23, 20, 26, .62); }

// ── 자동 루프(2초): 쌓기 → 나란히 → 쌓기. 복귀는 88% 안에 끝난다 ──
// 막대는 부드러운 transform, 라벨 교체는 steps(1, end) 컷(움직임 시작점에서 갈아입는다)
@for $i from 1 through 4 {
  @keyframes sk-a#{$i} {
    0%, 34%   { transform: translateX(0) scaleX(1); }
    44%, 76%  { transform: translateX(3%) scaleX(.44); }
    86%, 100% { transform: translateX(0) scaleX(1); }
  }
  // 지난 달 계열은 **가로로 먼저 비켜난 뒤에** 내려앉는다(그 반대로 올라탄다).
  // 가로·세로를 한꺼번에 보간하면 검은 막대가 파란 막대를 대각선으로 뚫고 지나가
  // 두 계열이 겹친 프레임이 생기고, 그 장이 곧 대표 이미지가 된다 (첫 판 실측)
  @keyframes sk-b#{$i} {
    0%, 34%   { transform: translateX(0) translateY(#{-1 * nth($ha, $i)}) scaleX(1); }
    44%       { transform: translateX(53%) translateY(#{-1 * nth($ha, $i)}) scaleX(.44); }
    52%, 76%  { transform: translateX(53%) translateY(0) scaleX(.44); }
    82%       { transform: translateX(53%) translateY(#{-1 * nth($ha, $i)}) scaleX(.44); }
    86%, 100% { transform: translateX(0) translateY(#{-1 * nth($ha, $i)}) scaleX(1); }
  }
  .sk.is-demo .sk__col:nth-child(#{$i}) .sk__b--a {
    animation-name: sk-a#{$i};
    animation-duration: $dur-loop;
    animation-timing-function: $easing;
    animation-iteration-count: infinite;
  }
  .sk.is-demo .sk__col:nth-child(#{$i}) .sk__b--b {
    animation-name: sk-b#{$i};
    animation-duration: $dur-loop;
    animation-timing-function: $easing;
    animation-iteration-count: infinite;
  }
}

// 합계 라벨 — 쌓기에서만 보인다(컷). 컷은 막대가 움직이기 시작하는 36% 가 아니라
// **다 도착한 52%**(복귀는 86%)에 둔다. 시작에 두면 막대가 아직 겹쳐 미끄러지는 중인
// 프레임이 「가장 크게 달라진 장」이 되어 대표 이미지로 뽑힌다 (첫 판 실측)
.sk.is-demo .sk__tot {
  animation-name: sk-tot;
  animation-duration: $dur-loop;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}
@keyframes sk-tot {
  0%        { opacity: 1; }
  52%       { opacity: 0; }
  86%, 100% { opacity: 1; }
}

// 버튼 라벨도 같은 박자의 컷 — 두 라벨이 겹치지 않는다
.sk.is-demo .sk__lab--side {
  animation-name: sk-lside;
  animation-duration: $dur-loop;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}
@keyframes sk-lside {
  0%        { visibility: visible; }
  36%       { visibility: hidden; }
  80%, 100% { visibility: visible; }
}
.sk.is-demo .sk__lab--stack {
  animation-name: sk-lstack;
  animation-duration: $dur-loop;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}
@keyframes sk-lstack {
  0%        { visibility: hidden; }
  36%       { visibility: visible; }
  80%, 100% { visibility: hidden; }
}

// 컷 옆의 보조 움직임 — 버튼이 살짝 눌렸다 돌아온다(페이드가 아닌 transform)
.sk.is-demo .sk__btn {
  animation-name: sk-press;
  animation-duration: $dur-loop;
  animation-timing-function: $ease-pop;
  animation-iteration-count: infinite;
}
@keyframes sk-press {
  0%, 36%, 80% { transform: scale(1); }
  40%, 84%     { transform: scale(.93); }
  46%, 90%     { transform: scale(1); }
}

@media (max-width: 340px) {
  .sk { padding: $sp-2; gap: $sp-1; }
  .sk__hint { display: none; }
  .sk__title { font-size: 12px; line-height: 16px; }
  .sk__legend { font-size: 10px; line-height: 14px; }
  .sk__btn { padding: $sp-1 $sp-2; font-size: 11px; }
  .sk__plot { grid-template-rows: 88px 14px; }
}

@media (prefers-reduced-motion: reduce) {
  .sk.is-demo .sk__b,
  .sk.is-demo .sk__tot,
  .sk.is-demo .sk__lab--side,
  .sk.is-demo .sk__lab--stack,
  .sk.is-demo .sk__btn { animation: none !important; }
  .sk:not(.is-demo) .sk__b { transition: none !important; }
}

html, body {
  margin: 0;
  overflow: hidden;
}

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ffd23f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.sr {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.sk {
  box-sizing: border-box;
  width: min(392px, 88vw);
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 0;
  padding: 12px;
  border-radius: 16px;
  background: #ffffff;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  color: #17141a;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

.sk__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 0 4px;
}

.sk__title {
  font-size: 13px;
  line-height: 18px;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.sk__btn {
  position: relative;
  display: grid;
  place-items: center;
  margin: 0;
  padding: 4px 12px;
  border: 0;
  border-radius: 999px;
  background: #2f6df6;
  color: #ffffff;
  font-family: inherit;
  font-size: 12px;
  line-height: 18px;
  font-weight: 800;
  cursor: pointer;
}

.sk__btn[aria-pressed=true] {
  background: #17141a;
}

.sk__btn:focus-visible {
  outline: 2px solid #17141a;
  outline-offset: 2px;
}

.sk__lab {
  grid-area: 1/1;
  white-space: nowrap;
}

.sk[data-mode=stack] .sk__lab--stack,
.sk[data-mode=side] .sk__lab--side {
  visibility: hidden;
}

.sk__legend {
  display: flex;
  gap: 12px;
  padding: 0 4px;
  font-size: 11px;
  line-height: 16px;
  font-weight: 700;
  color: rgba(23, 20, 26, 0.62);
}

.sk__key {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.sk__dot {
  width: 8px;
  height: 8px;
  border-radius: 4px;
}

.sk__dot--a {
  background: #2f6df6;
}

.sk__dot--b {
  background: #17141a;
}

.sk__plot {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: 96px 14px;
  column-gap: 8px;
  padding: 0 4px;
}

.sk__x {
  grid-row: 2;
  text-align: center;
  font-size: 11px;
  line-height: 14px;
  font-weight: 700;
  color: rgba(23, 20, 26, 0.62);
}

.sk__col {
  grid-row: 1;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  grid-template-rows: 20px 1fr;
  align-items: end;
  border-bottom: 1px solid rgba(23, 20, 26, 0.14);
}

.sk__tot {
  grid-row: 1;
  grid-column: 1/-1;
  align-self: end;
  justify-self: center;
  font-size: 10px;
  line-height: 14px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  color: rgba(23, 20, 26, 0.72);
}

.sk[data-mode=side] .sk__tot {
  grid-column: 1;
  grid-row: 2;
  justify-self: start;
  visibility: hidden;
}

.sk__b {
  grid-row: 2;
  grid-column: 1/-1;
  align-self: end;
  transform-origin: 0 100%;
  border-radius: 4px 4px 0 0;
}

.sk__b--a {
  background: #2f6df6;
}

.sk__b--b {
  background: #17141a;
}

.sk__col:nth-child(1) .sk__b--a {
  height: 45.6px;
}

.sk__col:nth-child(1) .sk__b--b {
  height: 18.2px;
}

.sk__col:nth-child(2) .sk__b--a {
  height: 27.4px;
}

.sk__col:nth-child(2) .sk__b--b {
  height: 16.7px;
}

.sk__col:nth-child(3) .sk__b--a {
  height: 36.5px;
}

.sk__col:nth-child(3) .sk__b--b {
  height: 22.8px;
}

.sk__col:nth-child(4) .sk__b--a {
  height: 15.2px;
}

.sk__col:nth-child(4) .sk__b--b {
  height: 9.1px;
}

.sk[data-mode=side] .sk__b--a {
  transform: translateX(3%) scaleX(0.44);
}

.sk[data-mode=side] .sk__b--b {
  transform: translateX(53%) translateY(0) scaleX(0.44);
}

.sk[data-mode=stack] .sk__b--a {
  transform: translateX(0) scaleX(1);
}

.sk[data-mode=stack] .sk__col:nth-child(1) .sk__b--b {
  transform: translateX(0) translateY(-45.6px) scaleX(1);
}

.sk[data-mode=stack] .sk__col:nth-child(2) .sk__b--b {
  transform: translateX(0) translateY(-27.4px) scaleX(1);
}

.sk[data-mode=stack] .sk__col:nth-child(3) .sk__b--b {
  transform: translateX(0) translateY(-36.5px) scaleX(1);
}

.sk[data-mode=stack] .sk__col:nth-child(4) .sk__b--b {
  transform: translateX(0) translateY(-15.2px) scaleX(1);
}

.sk:not(.is-demo) .sk__b {
  transition-property: transform;
  transition-duration: 220ms;
  transition-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
}

.sk__hint {
  margin: 0;
  padding: 0 4px;
  font-size: 11px;
  line-height: 16px;
  color: rgba(23, 20, 26, 0.62);
}

@keyframes sk-a1 {
  0%, 34% {
    transform: translateX(0) scaleX(1);
  }
  44%, 76% {
    transform: translateX(3%) scaleX(0.44);
  }
  86%, 100% {
    transform: translateX(0) scaleX(1);
  }
}
@keyframes sk-b1 {
  0%, 34% {
    transform: translateX(0) translateY(-45.6px) scaleX(1);
  }
  44% {
    transform: translateX(53%) translateY(-45.6px) scaleX(0.44);
  }
  52%, 76% {
    transform: translateX(53%) translateY(0) scaleX(0.44);
  }
  82% {
    transform: translateX(53%) translateY(-45.6px) scaleX(0.44);
  }
  86%, 100% {
    transform: translateX(0) translateY(-45.6px) scaleX(1);
  }
}
.sk.is-demo .sk__col:nth-child(1) .sk__b--a {
  animation-name: sk-a1;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: infinite;
}

.sk.is-demo .sk__col:nth-child(1) .sk__b--b {
  animation-name: sk-b1;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: infinite;
}

@keyframes sk-a2 {
  0%, 34% {
    transform: translateX(0) scaleX(1);
  }
  44%, 76% {
    transform: translateX(3%) scaleX(0.44);
  }
  86%, 100% {
    transform: translateX(0) scaleX(1);
  }
}
@keyframes sk-b2 {
  0%, 34% {
    transform: translateX(0) translateY(-27.4px) scaleX(1);
  }
  44% {
    transform: translateX(53%) translateY(-27.4px) scaleX(0.44);
  }
  52%, 76% {
    transform: translateX(53%) translateY(0) scaleX(0.44);
  }
  82% {
    transform: translateX(53%) translateY(-27.4px) scaleX(0.44);
  }
  86%, 100% {
    transform: translateX(0) translateY(-27.4px) scaleX(1);
  }
}
.sk.is-demo .sk__col:nth-child(2) .sk__b--a {
  animation-name: sk-a2;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: infinite;
}

.sk.is-demo .sk__col:nth-child(2) .sk__b--b {
  animation-name: sk-b2;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: infinite;
}

@keyframes sk-a3 {
  0%, 34% {
    transform: translateX(0) scaleX(1);
  }
  44%, 76% {
    transform: translateX(3%) scaleX(0.44);
  }
  86%, 100% {
    transform: translateX(0) scaleX(1);
  }
}
@keyframes sk-b3 {
  0%, 34% {
    transform: translateX(0) translateY(-36.5px) scaleX(1);
  }
  44% {
    transform: translateX(53%) translateY(-36.5px) scaleX(0.44);
  }
  52%, 76% {
    transform: translateX(53%) translateY(0) scaleX(0.44);
  }
  82% {
    transform: translateX(53%) translateY(-36.5px) scaleX(0.44);
  }
  86%, 100% {
    transform: translateX(0) translateY(-36.5px) scaleX(1);
  }
}
.sk.is-demo .sk__col:nth-child(3) .sk__b--a {
  animation-name: sk-a3;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: infinite;
}

.sk.is-demo .sk__col:nth-child(3) .sk__b--b {
  animation-name: sk-b3;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: infinite;
}

@keyframes sk-a4 {
  0%, 34% {
    transform: translateX(0) scaleX(1);
  }
  44%, 76% {
    transform: translateX(3%) scaleX(0.44);
  }
  86%, 100% {
    transform: translateX(0) scaleX(1);
  }
}
@keyframes sk-b4 {
  0%, 34% {
    transform: translateX(0) translateY(-15.2px) scaleX(1);
  }
  44% {
    transform: translateX(53%) translateY(-15.2px) scaleX(0.44);
  }
  52%, 76% {
    transform: translateX(53%) translateY(0) scaleX(0.44);
  }
  82% {
    transform: translateX(53%) translateY(-15.2px) scaleX(0.44);
  }
  86%, 100% {
    transform: translateX(0) translateY(-15.2px) scaleX(1);
  }
}
.sk.is-demo .sk__col:nth-child(4) .sk__b--a {
  animation-name: sk-a4;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: infinite;
}

.sk.is-demo .sk__col:nth-child(4) .sk__b--b {
  animation-name: sk-b4;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: infinite;
}

.sk.is-demo .sk__tot {
  animation-name: sk-tot;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}

@keyframes sk-tot {
  0% {
    opacity: 1;
  }
  52% {
    opacity: 0;
  }
  86%, 100% {
    opacity: 1;
  }
}
.sk.is-demo .sk__lab--side {
  animation-name: sk-lside;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}

@keyframes sk-lside {
  0% {
    visibility: visible;
  }
  36% {
    visibility: hidden;
  }
  80%, 100% {
    visibility: visible;
  }
}
.sk.is-demo .sk__lab--stack {
  animation-name: sk-lstack;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}

@keyframes sk-lstack {
  0% {
    visibility: hidden;
  }
  36% {
    visibility: visible;
  }
  80%, 100% {
    visibility: hidden;
  }
}
.sk.is-demo .sk__btn {
  animation-name: sk-press;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 1.4, 0.4, 1);
  animation-iteration-count: infinite;
}

@keyframes sk-press {
  0%, 36%, 80% {
    transform: scale(1);
  }
  40%, 84% {
    transform: scale(0.93);
  }
  46%, 90% {
    transform: scale(1);
  }
}
@media (max-width: 340px) {
  .sk {
    padding: 8px;
    gap: 4px;
  }
  .sk__hint {
    display: none;
  }
  .sk__title {
    font-size: 12px;
    line-height: 16px;
  }
  .sk__legend {
    font-size: 10px;
    line-height: 14px;
  }
  .sk__btn {
    padding: 4px 8px;
    font-size: 11px;
  }
  .sk__plot {
    grid-template-rows: 88px 14px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .sk.is-demo .sk__b,
  .sk.is-demo .sk__tot,
  .sk.is-demo .sk__lab--side,
  .sk.is-demo .sk__lab--stack,
  .sk.is-demo .sk__btn {
    animation: none !important;
  }
  .sk:not(.is-demo) .sk__b {
    transition: none !important;
  }
}

// 실제 동작: JS 는 data-mode 와 aria-pressed 에만 적는다. 막대가 어디 붙는지는
// CSS 가 data-mode 를 읽어 transform 으로 정한다 — grid 칸은 그대로다.
var sk = document.getElementById('sk');
var btn = document.getElementById('sk-btn');
var live = document.getElementById('sk-live');

btn.addEventListener('click', function () {
  var side = sk.dataset.mode !== 'side';
  sk.classList.remove('is-demo');
  sk.dataset.mode = side ? 'side' : 'stack';
  btn.setAttribute('aria-pressed', side ? 'true' : 'false');
  live.textContent = side ? 'Show side by side' : 'Show stacked';
});

import { useState } from "react";
import type { CSSProperties } from "react";
import styles from "./StackGroupSwitch.module.scss";

export type StackGroupSwitchProps = {
  title?: string;
  toggleLabel?: string;
  sideLabel?: string;
  stackLabel?: string;
  seriesA?: string;
  seriesB?: string;
  categories?: string[];
  totals?: string[];
  hint?: string;
  chartLabel?: string;
  tableCaption?: string;
  headChannel?: string;
  headTotal?: string;
  rows?: [number, number][];
  duration?: number;
  easing?: string;
  color?: string;
};

// 값은 vanilla(run/264/demo/06) 의 표와 같다 — 합계 84·58·78·32
export default function StackGroupSwitch({
  title = "채널별 방문",
  toggleLabel = "막대 배열 바꾸기",
  sideLabel = "나란히 보기",
  stackLabel = "쌓기 보기",
  seriesA = "이번 달",
  seriesB = "지난 달",
  categories = ["검색", "직접", "추천", "소셜"],
  totals = ["84명", "58명", "78명", "32명"],
  hint = "눌러면 같은 막대가 쌓기와 나란히를 오갑니다",
  chartLabel = "채널 4개의 이번 달·지난 달 방문 막대. 검색 60·24, 직접 36·22, 추천 48·30, 소셜 20·12",
  tableCaption = "채널별 방문자 수",
  headChannel = "채널",
  headTotal = "합계",
  rows = [[60, 24], [36, 22], [48, 30], [20, 12]],
  duration = 220,
  easing = "cubic-bezier(.2,.8,.2,1)",
  color = "#2f6df6",
}: StackGroupSwitchProps) {
  const [demo, setDemo] = useState(true);
  const [side, setSide] = useState(false);
  const vars: CSSProperties = { "--duration": `${duration}ms`, "--easing": easing, "--color": color } as CSSProperties;

  function toggle() {
    setDemo(false);
    setSide((v) => !v);
  }

  return (
    <div
      className={`${styles.sk} ${demo ? styles.isDemo : ""}`}
      data-mode={side ? "side" : "stack"}
      style={vars}
    >
      <div className={styles.head}>
        <span className={styles.title}>{title}</span>
        <button
          type="button"
          className={styles.btn}
          aria-pressed={side}
          aria-label={toggleLabel}
          onClick={toggle}
        >
          <span className={styles.labSide}>{sideLabel}</span>
          <span className={styles.labStack}>{stackLabel}</span>
        </button>
      </div>

      <div className={styles.legend} aria-hidden="true">
        <span className={styles.key}><i className={styles.dotA} />{seriesA}</span>
        <span className={styles.key}><i className={styles.dotB} />{seriesB}</span>
      </div>

      <div className={styles.plot} role="img" aria-label={chartLabel}>
        {categories.map((c, i) => (
          <div className={styles.col} key={c}>
            <span className={styles.tot}>{totals[i]}</span>
            <span className={`${styles.b} ${styles.bA}`} />
            <span className={`${styles.b} ${styles.bB}`} />
          </div>
        ))}
        {categories.map((c) => <span className={styles.x} key={"x" + c}>{c}</span>)}
      </div>

      <p className={styles.hint}>{hint}</p>

      <div className={styles.sr}>
        <span aria-live="polite">{side ? sideLabel : stackLabel}</span>
        <table>
          <caption>{tableCaption}</caption>
          <thead>
            <tr><th>{headChannel}</th><th>{seriesA}</th><th>{seriesB}</th><th>{headTotal}</th></tr>
          </thead>
          <tbody>
            {rows.map((r, i) => (
              <tr key={i}><th>{categories[i]}</th><td>{r[0]}</td><td>{r[1]}</td><td>{r[0] + r[1]}</td></tr>
            ))}
          </tbody>
        </table>
      </div>
    </div>
  );
}